halvorsen



H. B. .HALVORSEN. DRILL. FILED APR1 29, i918.

In the use ofl my improved construction,

'they member l is first moved over the end of thestiiclr' steeliintil'its bushing 8 is brought as close'as possible to the collar 9,' theA nclamping yoke in the meantimebeing heldk ont of the Way,"as Ytorinstancein the upper dotted line positionshovii iiiFig. 1. rlllien theyolre il, is movedinto the lovver dotted line position indicated in thatligure, i. e., .into position on the opposite/side of'. the collar 9vfrom the bushingf, andthe shaft i y i4 is then operatedto reciprocatethe yoke `to 'the ifull line or clamping position shown, either by aswinging' movement' of tliecranlr lto the right (Fig. l) or by arotation of thegrips 12T. the clamping position of the'gjjarts5 it willbeobscrved that the inem? ber-l is seciirely attached to' thev steel so4that that 'member and vlthe steell in effect` form a single element.''"Witli the partsV thusl clamped, air 4may obviously be supplied throughthe opening 3 into the axial 'opening,n l dit' the hollovvdrill steel insuoli a many neras tc'cause itto` exert a releasing' action -iipon thematerial Wedgiiig the steel in the hole. lt `will also be evident thatby means of'eith'er the cranlr 16 or the grips 17, the

member l `and the att-ached drill steel may bei rotated or'churned inthe hole as desired,

in such a manner as to release thesteel or to assistthe' air supply inreleasing the same y is aA result'oimy improvement, it will be observedthat an exceedingly simple 'and 'relatively' cheap device is prodircedwhich i is 'adapted to be applied with great facility tofthe protrudingend oi a stuck steel and to be used "very conveniently by an operator torelease the' steel from they hole. i Adte'n-y t-ionis` also directed tothe fact th'atthej,con-` 'struction 's Y.own is'exlceeding'ly rugged andWell"` adaptedto withstand Y the rough usage y "to which' suchv devicesare `subjected in s ,ervice, the only part 1which is at all susceptibleto Wear 'beingiftlie bushingS, which lmay,iob

viously, be changed Whenever desired. These and-other advantages of myimproved construction'-will, hovvever7 be clearlylap-v parent to thoseskilled in the art- Whilevl yhave in this yapplication specifikcallydescribed one em'boCliment `which my i inventionmay assume in practice,it Ito be understood thatjthis Jrorm of the same Ais used forpurposesfof illustration and `.that

' the invention may b e'niod'iied and embodied inl various other forms yWithout depaijtii'ig; fromvits spirit or the scopev of the appended .i

claims. f`

l What Iclaim as `new and desire tosecure by Letters Patent is l.. In tcombi ation,l a

member, cooperating"clamping 4member,

` and afriiember.A cooperatingivithsaid'rst named members` havingeccentrically arranged cylindrical portions, one of said members beingpivoted on'l one of'said portions and the other oisaid members being`"-f 3. ln combination, a drill steel receiving member, a cooperating 1clamping member carried thereby,'and means tor moving, said clamping;member longitudinally of ysaid re ceivingmember "com rising a hi epermitting` angular swinging moveme t lbetween said' members abouttlieaxis o'l said hinge, the 'longitudinal nioi'fement` of said.clamping member by said means While said steel receiving member remainsvstationary being `accompanied by movement ofy said hinge aXis in whichthe latter always'remains parallelto a )fixed line.

dlncombinaticn, a drill steel receiving member, `a"cooperating clampingmember carried thereby, and means including an element having 4eccentricbearing portions tive to tbevother.

a; In combination, a drill'steel receiving member. a cooperating'clamping member for reciprocating' one oiQL said members rela` carriedthereby, and means including -f= element provided ecceiitricy bearingportions for reciprocating said clamping member relative to saidfdrillsteel 'receiving member. l 1 6. ln combination,"a drill steel receivingmembenfan element provided with eccentric bearing' portions rotatablyVmounted thereon, andv la cooperating clamping, member carriedfon saidrecei'vingmember and mcv. able into or 4out of clamping positionas saidelementis rotated.

y 7.. ln combination, a drill steel receiving membena cooperating`member carried thereon and reci` rocable relative thereto andinovpablreA angnlarly relative thereto, andme'ansffor moving saidclampingm'ember longitudinally Without permit-` rotationtheredf;

S'Qln combination,V a drillv steelreceiving member7 a clamping membercarried thereon and reciprocable relative'thereto and movable angularlyrelative thereto,` and means for `reci'prcoatingy 'said clamping member'ivithoilit permitting rotation thereof.

f combination, a drill steel receiving member, a clampingmembercarriedthereby, reciprocable relative *thereto and lmovable angularllyrelative thereto, and means in? cluding an element providedvvitheccentric bearing portions toi" reciprocating said clamping`member. Y l

lO. In combination, a drill steelreceiving member having ajouriialonits'rear end, a shaft disposed'insafid journal and provided ivith an4eccentric portion, and a yoke-j disposable over steel at the oppositeend of said receiving member and `movable with said eccentric portion.

ll. llncombination, a drill steel receiving memben a shaft journaledthereon and provided with eccentric bearing portions, and a `clampingmember reciprocable relative to said receiving' member upon rotation ofsaid shaft and movable angularly relative thereto.

l2. ln combination, a drill steel receiving` ll. ln combination, a drillsteel receiving i member, a shaft jouriialedthereon and pron vided withveccentric bearing portions, a

clamping member reciprocable relative to said receiving member uponmovement of said shaft, and means for rotating said shaft or turningsaid receiving member bodily about the axis of tlie steel.

l5. In combination, a drill steelfreceiving'member, a shaftjournaledthereon `and provided with eccentric bea-ring' portions,`aclamping member reciprocable relative `to said receiving `member uponmovement of said shafnand means including a crank for rotating saidshaft or turning said receiving* member bodily` about the axis of thesteel.

i6. In combination, a drill steel receiving member, a shaft journaledthereon and provided with eccentric bearing portions, a clamping memberreciprocable. relative to said receiving member upon movement or' saidshaft, and means includinga pluralityk of oppositely extending handlesfor rotating said shaft.

17. In combination, a plurality of drill `steel clamping members, onereciprocable relative to the other and adapted to be disposed onopposite sides of a lateral projec-` tion on the shank of a drill steel,and means including a rotatable member having eccen.n tric portionsoperable to reciprocate said 7 movable member intov clamping position.

18. ln combination, a plurality of drill relative to the other andadapted -to bedis `posed `on opposite sides of a lateral projection ontliesluaiilr` of a drill steel,a rotatable member having eccentricportions, operable to reciprocate said movable member into clampingposition, and means for turning 4said members bodily about the airis ofa steel.

ln testimony whereof l aiiixgmy signature.

HALBERT B. HALVORSEN.

l steel clamping members, `one reciprocable f

